@jan_axhell Just untick the 'stack' box and it will display the panel and you'll have to live with it in that mode until Steven makes a decision on it's ultimate method of deployment.
Ok, something visible, but weird happened this time: as I unticked stack, a couple of genres appeared in the left sidebar, so I tried to change singer/band, but to do that, I had to disable THExpl, because as I said, either I see that OR the Navigator.
Then I switched it on again and nothing visible changed, but as I moved back and forth the tiny navigation arrows in the upper left corner, the navigator moved from a folder to another, but restricted to subfolders in that folder and the last 3 albums I had launched while experimenting.
For each folder I move to, a different bunch of genres appear in the left sidebar.
Quite confusing for now, but at least I managed to see something. :-)